Allow Multiple Dependent Variables

[cjleggett]

First of all, thanks for such a useful package! One thing that would be nice to add is support for regressions that do not have the same dependent variable. In R, this looks like:

While in Python, it appears that if multiple dependent variables are detected, none are displayed. I'll try and take a look at this if I have time in the next week or two, but wanted to flag it as an issue first in case I'm missing a solution that doesn't require a code change.